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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb03b769fea6524958bddf7e7ac23d9d5354898374c1f6131d51988b686af35' 
  AND token = 'aWjfdQ2/40eTIS2D6RYLVHUU6vOdt+8THc00R3zj0P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}